Grid structure



FIG. 1 is a top right side perspective view of a grid structure according to the present invention, the opposite side being a mirror image of the right side; and,

FIG. 2 is a bottom left side perspective view of the grid structure, the opposite side being a mirror image of the left side.

The characteristic feature of the design of a grid structure according to the present invention resides in the fact that the interpenetrating grid sections, which form the interstices defining the grid structure, have sinuous surfaces. 

The ornamental design for a grid structure, as shown and described. 